Ankh is a mysterious and pivotal character in the tokusatsu series Kamen Rider OOO. He is a Greeed, an ancient monster driven by desire, who forms an uneasy alliance with the protagonist, Eiji Hino. Ankh provides Eiji with the OOO Driver and Core Medals, enabling him to transform into Kamen Rider OOO. Though often selfish and cunning, Ankh gradually develops a complex relationship with the other characters, balancing his own ambitions with moments of unexpected compassion.